Waste Heat Recovery, Something Different but not New

Great read for the day from CNET, they're always great for new technology news. Just to convince you to read it, I'll quote something VERY promising:

One customer is taking wasted energy from a steel smelter to make 220 megawatts of electricity. That's on the order of a single large solar-power plant. Through waste heat recovery, the U.S. could generate the equivalent of 400 coal-fired power plants, Munson said.